Methods and systems for recovery of CO₂ gas in cement-­manufacturing facilities, and processes for manufacturing cement

(22) 17.03.2015

(43) 02.07.2015

(57) An object of the present invention is to separate CO₂ gas generated in a cement-manufacturing facility in a high concentration and recover the CO₂ gas. The present invention includes: feeding a cement material before calcination and a heat medium which has a particle diameter larger than that of the cement material and has been heated to the calcination temperature or higher in a medium-heating furnace (14), to a mixing calciner (12); and recovering the CO₂ gas generated by the calcination of the cement material. The heat medium circulates between the medium-heating furnace and the mixing calciner. Another aspect of the present invention includes: feeding a cement material before calcination to a regenerative calciner (112) which has been heated to the calcination temperature or higher and has stored heat therein; and recovering the CO₂ gas generated by the calcination of the cement material.

(71) Mitsubishi Materials Corporation, Tokyo (JP)

(73) Mitsubishi Materials Corporation, Tokyo (JP)